Valve-grinding tool



Apr. 3,1923

W. S. ,BELLOWS VALVE GRINDING TOOL Filed Mar. 9, 1918 A TTORAIEV The 1' new and useful improvements in valve grinding tool.

. use with one Patented Apr. 3,

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WORCESTER, INC, 015 WORCESTER,

MASSACHUSETTS.

MASSACHUSETTS, A CORPORATION OF VALVE-GRINDING TOOL.

Application filed March 9, 1918.

T (1H whom it may concern: 7

Be it known that I, WARREN S. BELLoWs, a citizen of the United States, residing in the city of Worcester and State of Massachusetts, have invented certain new and useful Improvements in l' alve Grinding Tools, of which the following is a specification.

present invention relates to certain grinding tools, one ob ect of the invention being to provide a device of this character embodying novel features of construction whereby it can be adapted for grinding either valves of the type characterized. by a plurality of spaced pockets in the 'head thereof for grinding purposes, or those valves provlded with a groove to receive a Another object of the invention to provide a grinding tool of the character described which isprovided with a double ended bit, one end whereof is adapted for e of the above types of valves while the other end is adapted for use with the other type of valves, means being provided whereby either end of the bit can beeasily and quickly brought into operative position and the other end simultaneously thrown into inoperative position. 1

.Further objects of the invention are to provide novel means for positively and permanently connecting the bit to the stock, and to provide means for holding one end of the bit in anoperative position and the other end. in an inoperative position while the grinding operation is continued.

F or a full understanding of the invention reference is to be had to the following description and accompanying drawing in which: 7

Figure 1 is a side elevation of a valve grinding tool constructed in accordance with the invention showing the manner of applying the same to one type of valve.

Fig. 2 is a detail perspective view of the lower end of the tool and bit, showing the locking sleeve in an inoperative position and the end of the bit adapted for use with one type of valve in operative position.

Fig. 3 is an enlarged side elevation of the lower end of the tool, and a fragmentary view of another type of valve, showing the end of the bit adapted for use with the valve in an operative position.

Serial No. 221,404.

Fig. i the bit.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawing by the same reference characters.

Referring to the drawing, the numeral 1 designates the stock of the tool which is preferably formed of avsingle rod of metal of substantially circular cross-section, the upper end of which has swiveled thereto a handle or knob 2, and an intermediate portion of which is offset as at 3 to provide in effect a crank for rotating the stock 1. The lower end of the stock 1 is bifurcated at 4; to receive 'a valve-engaging bit 5.

The bit 5 is formed of flat metal of athickness and length to fit loosely within the bifurcation 4 of the stock 1, the said bit 5 be ing provided at substantially the center of its length with an opening 6 adapted to receive a pivot pin 7 extending transversely of the bifurcation at pivotally mounting the bit in said bifurcation. One end of the bit 5 is enlarged and bifurcated at 8 to provide a pair of opposed spaced studs 9 which are adapted to fit into and engage openings a, in the head of one type of valve A, the bifurcation 8 being the diameter of the stock 1, while the other end is flattened to form a chisel edge 10 adapted to fit into and engage a groove 6 in another type of valve B, said chisel edge being of a width substantially equal to the diameter of the stock 1. The bit 5 is pivoted in the bifurcation 4 in such a manner that the lower end of the bit projects beyond the lower end of the stock 1 so as to allow the proper end of the bit to be. inserted into either the sockets a or groove 5 of the valve to be ground, while the other end of the bit is housed by the bifurcation 1.

For the purpose of locking the bit 5 against rotation about the pivot pin 7when the tool is in operation, a locking sleeve 11 is provided. This sleeve 11 is loosely mounted upon the stock 1 and has both a sliding and rotary movement thereon. The sleeve 11 is provided upon one side thereof with a longitudinally extending slot 12 opening through the bottom edge of the sleeve and adapted to receive a pin 13 projecting from the stock 1. The downward movement of the sleeve 11 on the stock 1 is limited by engagement of the upper end of is a detached perspective View of substantially wider than the bit 5 against rotation with the bifurcated end 8 thereof in operative position the sleeve 11 is allowed to slide downwardly with the pin 13 in slot 12 to its limit. In this position the lower end of the sleeve 11 overlaps both sides oi? the bifurcation a of the stock and the chisel end 10 of thebit so that movement of the bit is impossible. To reverse the ends of the bit and bring the chisel end 10 of the bit into operation, the sleeve 11 is raised, as shown by Fig. 2, to clear the bifurcation a and the bit rotated on pivot pin 7 to swing the bifurcated and studded end 8 of the bit into the bifurcation a of the stock. after which the sleeve is again allowed to slide downwardly to its limit. The studs 9 project outwardlybeyond the sides of the stock and the lower edge of the sleeve 11 now becomes interposed between the studs 9 on the bit and the stock 1 on both sides thereof, as shown by Fig. 3, so as to prevent rotation of the bit. In order to throw the sleeve out of operation, it is merely necessary to raise the same so as to clear the slot 12 from the pin 13, after which the sleeve is slightly rota-ted. This rotation causes the slot 12 to be moved out or alinement with the pin 13 so that the lower edge of the sleeve '11 rests upon the pin 13. against downward movement on the stock and clear of the bit 5 until the sleeve is again rotated to bring the slot 12 into alinement with the pin 13.

In the operation of the tool the bit 5 is adjusted to present the proper end thereof for use with the valve to be ground, and the bit 5 caused to engage the valve in the usual manner. The handle or knob 2 of the stockis then grasped'in one hand and thefoffset portion 3 of the stock grasped in the other hand, the required pressure being exerted on the valve through the knob 2. The stock 1 is then rotatedback and forth through an angle of about 180 by the offset portion 3 'in the usual manner until the'valve is properly fitted to its seat.

\Vith the above-described construction it will be noted that two bits are combined into one and mounted in such a manner that both are always on hand and positively The sleeve 11 is thus held said bit may be locked in one operative connected to the stock, either one being easily and quickly brought into operative position and securely locked. This eliminates the bother and time lost incident to the interchanging of two or more separate hits as are utilized at the present time in connection with many modern valve grinders. The bits used in connection with valve grinders adapted to accommodate only one bit at a time are easily misplaced and often lost. The bit embodied in the present invention is practically insured against loss.

Having thus described my invention,what

I claim as new and desire to secure by Letters Patent is:

1. A valve grinding tool including a stock, a valve-engaging bit pivotally connected to said stock and provided with a plurality of studs and a locking member mounted on said stock and adapted to engage the said studs to lock the bit against rotation about its pivot.

2. A valve grinding tool comprising a stock having a bifurcated end a valve engaging bit pivotally mounted in said bifurcated end, said bit being double-ended, one end being formed into a chiseled edge for engaging a co responding groove in a valve. and the other end being wider andprovided with a pair of projections for engaging corresponding openings in a valve. and a locking sleeve slidably mounted on said stock, said sleeve having an internal opening substantially equal to the width of said I chisel-edged end of the bit and having an external diameter substantially equal to the distance between said valve engaging proections 011 the other end of the bit, whereby sition by passing said sleeve over the chisel-edged end of the'bit, and in the otherposition by causing said sleevejto enter between said projections and astop for'limiting the movement of said sleeve.

8. A valve grinding tool including a stock, a reversible double-ended bit pivotally mounted upon the stock and having o-neend thereof comparatively narrow while the other end thereof is flared and provided with laterally projecting studs, and a'sleeve slidable upon the stock and adapted either to receive the narrow end of the bit or engage the studs thereof to lock the bit in operative position.

WARREN s. B'ELLows. 

